JPH0539191Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a bottom rail that is suspended and supported at the lowest part of a blind.

(Prior art) Conventionally, as a type of blind, there has been a blind in which slats molded from synthetic resin into a chevron-shaped cross section are suspended from a head box in multiple stages via ladder cords, and the slats can be raised and lowered and the angle can be adjusted. It has been put into practical use. In such blinds, when the slats are fully closed, they are rotated so that one oblique side of the slats, which have a chevron-shaped cross section, is in the vertical direction.

(Problem that the invention aims to solve) However, in the above-mentioned blind, even if the angle of the slat is adjusted to the fully closed state, one of the oblique sides of the slat will rotate vertically due to loosening of the ladder cord or due to the weight of the slat. When the slat is twisted in the longitudinal direction, there is a problem in that one oblique side cannot be rotated in the vertical direction.

Structure of the invention (Means for solving the problem) In order to solve the above problem, this invention suspends and supports a slat formed in a chevron-shaped cross section with two hypotenuses in multiple stages vertically using a ladder cord. In a blind in which a bottom rail is suspended and supported at the lower end of the ladder cord, and the angle of each slat can be adjusted by driving the ladder cord, the bottom rails 4, 12 are provided with oblique sides 7, 8 having the same shape as the slats 3. The center of gravity is located near one of the hypotenuses 8.

(Function) By the above means, one hypotenuse 8 becomes the other hypotenuse 7.
If the angle is adjusted so that it is downward, almost the entire weight of the bottom rails 4, 12 is supported by the warp threads 2a supporting the oblique side 8 of the ladder cord 2, and the oblique side 8 is rotated almost vertically. .

(Embodiment) An embodiment embodying this invention will be described below with reference to the drawings.A blind 1 is suspended and supported by multiple slats 3 from a head box (not shown) via a plurality of ladder cords 2. A bottom rail 4 is suspended from the lowest part of the ladder cord 2. In the ladder cord 2, two weft threads 2c and 2d are strung vertically in multiple stages between warp threads 2a and 2b.

The slat 3 is made of synthetic resin and is formed into a chevron-shaped cross section with two oblique sides consisting of a long side 5 and a short side 6, and its height is equal to the weft 2c of the ladder cord 2.
It is formed slightly higher than the interval of 2d, and its weft 2
It is supported sandwiched between c and 2d. Therefore, when each slat 3 is supported in the horizontal direction, it is sandwiched between the weft threads 2c and 2d, and the torsion in the longitudinal direction of the slat 3 is corrected.

The bottom rail 4 has the same short side 7 as the slat 4.
A reinforcing portion 9 is integrally formed with a triangular cross section on the lower surface and the lower surface of the tip of the long side 8, and a weight portion 1 is formed on the upper surface of the long side.
0, and the center of gravity W1 in the cross section of the bottom rail 4 is located near the long side 8 within the weight portion 10. An avoidance groove 11 is formed in the bottom rail 4 at the connecting portion of the ladder cord 2 so that the weight portion 10 is removed so that the ladder cord 2 does not interfere with the weight portion 10.

Now, when the angle of the slat 3 is adjusted to a fully closed state in the blind 1 formed in this way, the center of gravity W1 of the bottom rail 4 is located outside of both warp threads 2a and 2b of the ladder cord 2, as shown in FIG. Since the bottom rail 4 is rotated so that almost the entire weight of the bottom rail 4 is supported by the warp 2a supporting the long side 8 of the bottom rail 4, the warp 2a is rotated to the long side 8 of the bottom rail 4. Since the warp yarns 2a and 2b extend upward along the same line, the distance between the two warp yarns 2a and 2b becomes minimum. Each slat 3, which has the same shape as the short side 7 and long side 8 of the bottom rail 4, is sandwiched between both warp threads 2a and 2b, and an upward pulling force is applied to the tip of the short side 6 by the weft thread 2d. Naturally, each long side 5 is the warp 2
It comes into close contact with a. Therefore, each slat 3
are reliably rotated to the fully closed state, and even if there is twist in the longitudinal direction of the slat 3, both warp threads 2
The twist is corrected by a and 2b to ensure a fully closed state.

Further, this invention can also be implemented in a manner as shown in FIG. That is, bottom rail 1
By slightly increasing the thickness of the long side 8 of the bottom rail 12, the center of gravity W2 in the cross section of the bottom rail 12 is positioned slightly below the long side 8. In such a configuration, when the angle of the slat 3 is adjusted to the fully closed state as shown in FIG. 4, almost the entire weight of the bottom rail 12 is supported by the warp threads 2a supporting the long side 8, as in the previous embodiment. Each slat 3 is reliably rotated to the fully closed state.

In addition, in the above embodiment, the short side 7 of the bottom rail 4
The long sides 8 and 8 have the same shape as the short sides 6 and long sides 5 of the slats 3, but when each slat 3 is fully closed, the warp threads 2a of the ladder cord are aligned with the long sides 5 of the slats 3.
A similar effect can be obtained if the shape is in close contact with.

Effects of the device As detailed above, this device suspends and supports a slat formed into a chevron-shaped cross section with two hypotenuses in multiple stages vertically using a ladder cord, and suspends and supports a bottom rail from the lower end of the ladder cord. In a blind in which the angle of each slat can be adjusted by driving the ladder cord, the angle of the slat 3 can be reliably adjusted to the fully closed state, and the twist of the slat 3 can also be corrected by the ladder cord 2, so that the slat 3 is fully closed. It exhibits excellent effects that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the bottom rail embodying this invention, Fig. 2 is a vertical cross-sectional view showing the slat in a fully closed state, and Fig. 3 is a longitudinal cross-sectional view showing another example of this invention. A top view and FIG. 4 are longitudinal sectional views showing the slats in a fully closed state. Ladder cord 2, slat 3, bottom rail 4, 12, short side 7, long side 8, center of gravity position W1, W
2.

Claims (1)

[Scope of utility model registration request] A slat formed into a chevron-shaped cross section with two hypotenuses is suspended vertically in multiple stages using a ladder cord, and a bottom rail is suspended and supported from the lower end of the ladder cord.
In a blind in which the angle of each slat can be adjusted by driving the ladder cord, bottom rails 4 and 1 are provided with oblique sides 7 and 8 having the same shape as the slats 3.
The bottom rail of the blind is characterized in that the center of gravity W1 and W2 of the two are located near one of the oblique sides 8.